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Angular Reactive Forms or Model Driven Forms
Angular reactive forms facilitate a reactive style of programming that favors explicit management of the data flowing between a non-UI data model (typically retrieved from a server) and a UI-oriented form model that retains the states and values of the HTML controls on screen. Reactive forms offer the ease of using reactive patterns, testing, and validation.
With reactive forms, you create a tree of Angular form control objects in the component class and bind them to native form control elements in the component template, using techniques described in this guide.
You create and manipulate form control objects directly in the component class. As the component class has immediate access to both the data model and the form control structure, you can push data model values into the form controls and pull user-changed values back out. The component can observe changes in form control state and react to those changes.
One advantage of working with form control objects directly is that value and validity updates are always synchronous and under your control. You won’t encounter the timing issues that sometimes plague a template-driven form and reactive forms can be easier to unit test.
In keeping with the reactive paradigm, the component preserves the immutability of the data model, treating it as a pure source of original values. Rather than update the data model directly, the component extracts user changes and forwards them to an external component or service, which does something with them (such as saving them) and returns a new data model to the component that reflects the updated model state.
Using reactive form directives does not require you to follow all reactive priniciples, but it does facilitate the reactive programming approach should you choose to use it.
Reactive forms take a different approach compared to that of the template-driven forms. Here, we create and initialize the form control objects in our component class. They are intermediate objects that hold the state of the form. We will then bind them to the form control elements in the template.
The form control object listens to any change in the input control values, and they are immediately reflected in the object’s state. Since the component has direct access to the data model structure, all changes can be synchronized between the data model, the form control object, and the input control values.
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